Pump



M. B. HOLSTEIN.

PUMP.

APPLICAUON FILED MAY 6, 1919.

Patented Feb. 10, 1920.

@vi/humo MICHAEL B. HOLSTEIN, or HIGHLAND, PENNSYLVANIA.

PUMP.

Specircation of Letters Patent. I Y Patented Felj, V10, 1920,

Application filed May 6, y1919. Serial N'o. 295,189. p

To all whom 15mm concern Be it known t at I, MICHAEL B. vHoi.- STEIN, a citizen of the United States, residing at Richland, in the county of Leb-anon and State of Pennsylvania, have inventedA certain new and useful Improvements in Pumps; and I do .hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to pumps and contemplates more especially an improved multi-barrel air-compressing pump for inflating pneumatic tires.

An object of the present invention' is the production of a compound pump in which a maximum quantity of air is progressively compressed and finally discharged into the article to be inflated by `a direct downward movement of one of the pistons.

Another object of the invention isto `produce a compound pump comprising a series 'of concentric barrels the innermost t'wo of whichA are relatively closely s acedV from each other for purposes of reaC ily conveying the air from the outer or low pressure cylinder to the inner or high pressure 'cylin.

der in such a manner as to assist the operation in an upward stroke of the pump, and to admit partially compressed air into the high pressure cylinder whereby on the downward stroke of the pump the air .is further compressed and discharged directly into the article being inflated.

A further object of the invention resides in the production of a simple, durable and eiiicient pump which can be easily assembled and disassembled, and in which the best quality of relatively exible and tough packing material or cups may be utilized withV a minimum amount of depreciation or wear. Y

With these and other objectsin view, the invention further consistslin` the combination and arrangement ofthe several parts including an adjustable handle which can be readilyV secured to the outer barrel atV different heights whereby a full stroke and consequent maximum eiciency is always obtainable with the expenditure of the least possible effort.

In the accompanying drawings illustrating an embodiment of myinvention, and

lin vwhich similar reference lcharacters designate corresponding parts, l Figure 1 is a pey proved pump, and

F ig. 2 is an enlarged vertical sectional view.

The present invention has been. primarily designed for usein .connection with inflat-f ing'aut'omobile tires. Heretofore attempts have been made to produce a commercially successful pump in which air would be pro-k gressively compressed and easily discharged into the tire. Certain diiliculties have, how- Those in particu-l ever, been experienced. lar khave been non-durabili'tyof the packing, because of the vdirect wear thereof on the stem or piston rod lof .the high pressure piston; an excessive manual strain upon the operator in supplying and compressing la` suflicient amount of air; and complexity of construction tending to make the repair.

of the pump a most'tedious task,` as w'ell as Va comparatively expensive'one. Y

f The present .invention overcomes these c lifliculties, and comprises amongV other things, an outer low pressurev cylinder rspective view of my imkso formed by a relatively large movable barrel; y

a stationary piston member for said cylinvder; van inner high pressure cylinder formed of a relatively small stationary barrel; a piston for said high pressure cylinder connected to and` movable with the barrel of the low pressure cylinder; and ymeans vincluding a novel form of concentric air conduit or passageway, foriconveying the air from the low to the high pressure cylinder.

Referring tothe drawings, the pump yis shown ,as particularly adapted for foot and `hand use, although it will be understood that other applications ofthe :principles of the invention may be resortedlftowithout departing from the spirit thereof, and I do not limitmyself to the exact disclosure set forth herein. The pump 1 is supported upon a vbase 2, and is provided with `a eX ible tube 3, for attachment Lto the valve of a-tireas will be readily understood.. The handle 4: is adjustably secured -to vthe pump and being of novelf construction will hereinafter be described indetail.

The low pressurecylinder,5 is formed beinner stationary barrelv 7. The stationary barrel 7 Vis suitably secured or shrunk :over

Y tween. an .outer movable barrel 6, and an v by a nut 19, as shown.

a base plug 8 provided ywith an interlocking shoulder 9 and screwed into the base or support 2, as shown. The shoulder 9 rests upon an upstanding boss 10 formed integral with the base 2, and serves to form a rigid yet easily detachable connection. The base plug 8 is slightly tapered-as at 11, the upperend of the lsaid tapered portion 11 terminating in a shoulder and reduced portion 12 of the plug upon and against which the stationary barrel 7 is brazed or otherwise secured. An opening 13 is formed throughthe plug 8, and 'serves to conduct the compressed air from the pump to a chamber 14 in the base 2,

from whence it passes into the tube 3 without interruption by valves or other check devices.

`The stationary piston 15 which coperates withy the movable barrel 6 of the low pressure cylinder is threaded as at 16 upon the vupper end of the stationary barrel 7. The piston 15 comprises a flanged member 17 yupon which a cup packing 18 is 'held in place The cup packing 18 is of a durable and yielding character, and

is arranged so that its lower 'flange 2O extends downwardly, as shown. It will be seen that upon the down stroke of the barrel 6 the flange 2O of the packing will yield sulliciently to allow air to enter openings 21 in the cap 22 and pass into the low pressure cylinder. Upon the up stroke, the lange'20 y! ofthe packing will be forced against the inner wall of the barrel 6 and permit of its being compressed as will be presently described.y A

They upper endV of the stationary barrel 7 is provided with a flange 23 which abuts -vagainst the. vflanged member 17, as shown, and is further formed with an internally threaded portion 24 intowhichthe upper f end of the barrel 25 o'f the high pressure cylinder is secured.

The barrel 25 of the high pressure cylinder is slightlyy spaced from the inner barrel `7 of the low pressure cylinder, thereby producing a concentric'air conduit or passageway 26 extending throughout the length of the pump and for a purpose'to be presently described. Brazed or otherwise secured to the lower end of the barrel 25 of the high pressure cylinder is a lixed head member 27 having a threaded portion 28. A cup packing 29- is positioned against this head 27 and has aldepending flange 30, as shown. The flange 30 is of yielding material and is designed to terminate short of the upper end of the base plug 8, as shown. A nut and vwasher 31 serves'to secure the packing 29 imposition.

In operation, the flange 30 of the packing yyields sulciently to permit the passage of the'air as it is compressed by the up stroke of the` barrel 6 and forcedvfrom the low pressure cylinder through opening 32 downwardly through the concentric passageway 26. Upon the downstrokeof the piston of the high pressure cylinder the flange 30 is forced against the inner wall of its stationary barrel 7 as will be understood.

An opening 33 extends through the head' threaded as at 38 and receives a nut 39 between which and the head 36 a cup or other packing 40- is positioned. In practice, the

v packing` 40 may be of relatively hard or stiff material capable of long usage and need not be as yielding in quality as those heretofore described. This will be apparent, for thereqis but one function of the high pressure piston, and that is to further compress the initially compressed air andfl'orce same through the tube 3 into the tire being inflated.

The piston rod 37 extends upwardly through the high pressure cylinder, and is lsecured to the cap 22 by shrinking, brazing, or in any other suitable manner. By this construction it will be seen that the high pressure pistonand outer barrel 6 of the' low pressure cylinder move together. lt will also be Ynoted that the usual packing or stuffing box through which the piston rod of the high pressure piston has heretofore usually passed, is eliminated, and a direct thrust made possible for discharging the progressively compressed air, in an easy manner and without the usual frictional rcvsistancel due to the packing of thev piston rod.

A. spring member' 41 is shown as interposed between the cap 22 and the flanged end 23 of the stationary barrel 7. This spring serv-es to arrest and absorb the dow-nward thrust of the pump, as will be understood. It is perforatedat 41 to permit ot the pistod rod passing freely therethrough. W'hile I have shown this form of cushion- -ing device, it will be understood thaty other types may be readily inserted.

The movable-barrel G of the low pressure cylinder is provided at its lower end with a detachable head section 42, as clearly shown in Fig. 2. This head section 42 moves with the `barrel 6 and slides upon the stationary barrel 7. It comprises a packing 43 designed. to prevent the escape of air from the low pressure cylinder, and a ring member 44 suitably secured to the barrel 6, as by thread 45. The member 44 is provided with an upstanding flange 47 between which and the barrel 7 the'packing 43 is positioned.

Another member 4S having a downwardlyV extending guiding sleeve 49v is 'threaded -into the aforesaid member 44 rand 'this head' section 42 can be easily removed,

whereby, together' with thefrem'oval of the cap 22, the lpump can be further and completely disassembled. y

. The handle 4 is vshown as comprising a circular Vclamping portion 47 from which 'eX-tend hand gripping sections. Bolts 48 extend through ears-49 formed on said circular portion and vserve 'to securely attach the handle `to the barrel 6 in an adj-usted position. The hand -gripping sections are preferably uni-form indiameter, and are arranged diametrically opposite vas shown.

`l? rom .this construction it will `be seen that for persons of varying heights the adjust- -ment of the handle 4 will conveniently permit of a full stroke with a vminimum expenditure of effort.

The operation follows:

An operator grasps `the handle 4 and moves the outer barrel. 6 upwardly, giving to the pump what is termed an upstroke. In impartingl a downward movement or down stroke to the barrel 6, air is drawn in through the openings 21 in the cap 22. This air passes the flange 20 of the cup packing 18 and fills the low pressur-e cylinder 5. Upon the succeeding upstroke this air is gradually compressed and for-ced through the openings 32 in the stationary barrel 7, into the concentric .conduit or passageway 26, from where it passes downwardly, forcing its way past the yielding flange 30 of the cup packing 29 and into the chamber 34. From this chamber it first begins to pass into the article being iniiated up to a pressure of approximately twenty pounds, more or less, after which the partially compressed air passes upwardly through the opening 33 into the high pressure cylinder. The effect of this partially compressed air entering the high pressure cylinder' beneath the piston 35 is to assist the upward movement of said piston as will be understood.

Upon the succeeding downstroke of the pump the high pressure piston 35 will further compress the air and force it directly through openings 33 and 13 into the chamber 14 and thence into the tube 3 by which it is conducted to the tire or other object being inflated.

It will be seen from the foregoing that upon the down stroke of the pump, air is initially drawn into the pump and at the same time the heretofore. progressively compressed air is discharged from the pump through the tube 3. Upon the upstroke of the pump the air is partially compressed, and directed into the high pressure cylinder beneaththe piston ytherein for purposes of assisting the upward movement of same. This course of the a-ir occurs, it will be noted, after the 4discharge of lthe initially compressed air has passed through the chamber 34up yto a `pressure of about twenty 'pounds, more or less, in the double acting yoperation of the pump,fas will befunder.- stood.

' From the foregoing it will be obvious that an efficient and `easily operated hand pump has been produced, wherein advantage of 'extreme Alongevity of use has vbeen r75 made possible, together with a *constructional Yarrangement for purposes ofrepair heretofore unknown. Y f

I claim: y'

1. A pump of the class described comprising a low pressurecylinder formed of relatively movable 'and stationary barrels, a. piston for said low pressure cylinder carried by the stationary barrel, a high pressure cylinder. consisting` of a stationary barrel closely spaced from the stationary'barrelof the vlow vpressure cylinder, a 'piston forsaid high pressure cylinderconnected to and movable with the movablebarrel of the low pressure cylinder, and means including the pas.- sageway formedl between the aforesaid closely spaced stationary barrels for conducting the compressed air from the low to the high pressure cylinder.

2. A pump of the class described comprising a low pressure cylinder formed of relatively movable and stationary barrels, a piston for said low pressure cylinder carried by the stationary barrel, a high pressure cylinder consisting of a stationary barrel located within and closely spaced from the aforesaid stationary barrel of the low pressure cylinder, a piston for said high pressure cylinder connected to and movable with the movable barrel of the low pressure cylinder, and means includingl a flexible packing located in the passageway formed between the aforesaid closely spaced barrels for admitting the partially compressed air tothe high pressure cylinder beneath the piston therein.

3. A pump of the class described comprising an outer movable barrel and an innerV stationary barrel forming a low pressure cylinder, a stationary piston for said low pressure cylinder, another stationary barrel located within and closely spaced from the aforesaid stationary barrel forming a high pressure cylinder, a movable piston for said high pressure cylinder connected to and movable with the movable barrel of the low pressure cylinder, and means for admitting the partially compressed air between the aforesaid closely spaced stationary barrels' to the high, pressure cylinder beneath the piston therein.

4. A pump of the class described comprising an outer movable barrel and an inner stationary barrel forming a low pressure cylinder, a stationary piston therefor including a flexible packing around which air is 130 initially drawn into the pump, another stationary barrel closely spaced from the aforesaid stationary barrel forming a high pressure cylinder, a movable piston therefor,- and a flexible packing located in the passageway formed between the closely spaced barrels whereby air is partially compressed and conducted rom the low pressure cylinder to the high pressure cylinder beneath the movable piston therein on the up stroke of the pump, and further compressed and discharged from the pump on the down stroke thereof.

5. A pump of the class described comprising an outer movable barrel and an inner stationary barrel having an opening therein at its upper end, a stationary piston provided with a flexible packing and located within said lbarrels,.=another stationary'barrel located within and closely spaced from the aforesaid stationary barrel, a movable piston therefor interconnected and movable with the outer movable barrel, and a flexible packing l0- cated in the passageway formed between the closely spaced barrels at their lower ends whereby air is partially compressed by the .upward movement of the outer `barrel and conducted downwardly through the aforesaid passageway into the second mentioned stationary barrel beneath the piston therein.

6. A pump of the class described comprising a supporting base, a barrel secured to said base, a second barrel secured to the aforesaid barrel, a movable barrel encircling the first mentioned barrel, a cap for said movable barrel7 a piston rod secured to said cap and provided at its lower end with a piston operable within the second mentioned barrel, a spring member interposed between said cap and the upper end ofthe barrel secured to the supporting base, and a handle secured to said outer barrel for operating the pump.

In testimony whereof I affix my signature in presence of two subscribing witnesses.

MICHAEL B. HOLSTEIN. Witnesses:

SARAH BURKHOLDER, SUSAN KEGERREIS. 

